11、整合Mybatis
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Spring

114 字
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1 分钟内

步骤：

  1. 导入相关jar包
    • junit
    • mybatis
    • mysql数据库
    • spring相关的
    • aop织入
    • mybatis-spring
  2. 编写配置文件
  3. 测试

11.1、Mybatis

  1. 编写实体类
  2. 编写核心配置文件
  3. 编写接口
  4. 编写Mapper.xml
  5. 测试

举个🌰：

首先先导入maven依赖

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>
  1. 实体类 User.java 
    public class user {
   private int id;
   private String name;
   private String pwd;

   @Override
   public String toString() {
       return "user{" +
               "id=" + id +
               ", name='" + name + '\'' +
               ", pwd='" + pwd + '\'' +
               '}';
   }

   public int getId() {
       return id;
   }

   public void setId(int id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getPwd() {
       return pwd;
   }

   public void setPwd(String pwd) {
       this.pwd = pwd;
   }
}
  2. 核心配置文件 mybatis-config.xml 
    <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

   <typeAliases>
       <package name="com.yao.pojo"/>
   </typeAliases>

   <!--    用于指定使用哪个环境     default: 用于指定使用的环境id  -->
   <environments default="development">
       <!--     用于配置开发环境     id: 环境的唯一识别码    -->
       <environment id="development">

           <!--      事务管理器  type: 用于设置mybatis采用什么方式管理事务      JDBC表示采用和JDBC一样的事务管理方式    -->
           <transactionManager type="JDBC"/>
           <!--      数据源/连接池, 用于配置连接池和数据库连接的参数     type: 用于设置mybatis是否采用连接池技术      POOLED表示MyBatis采用连接池技术     -->
           <dataSource type="POOLED">
               <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
               <property name="url"
                         value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"/>
               <property name="username" value="root"/>
               <property name="password" value="rootroot"/>
           </dataSource>
       </environment>
   </environments>

   <mappers>
       <mapper class="com.yao.mapper.UserMapper"/>
   </mappers>

</configuration>
  3. 编写接口 UserMapper 
    public interface UserMapper {

   //无参
   public List<user> selectUser();

//    普通方式传参
//    public List<user> selectbuid(String user,String pwd);

   //使用注释传参
   public List<user> selectbyid(
           @Param("name")String user,
           @Param("pwd")String pwd
   );

}
  4. 编写mapper.xml 
    <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.yao.mapper.UserMapper">

   <select id="selectUser" resultType="user">
       select * from mybatis.user;
   </select>

<!--    普通传参-->
<!--    <select id="selectbyid" parameterType="java.lang.String" resultType="user">-->
<!--        select * from mybatis.user where id = #{id};-->
<!--    </select>-->

<!--    注释传参-->
   <select id="selectbyid" resultType="user">
       select * from mybatis.user
       where name=#{name} and pwd=#{pwd};
   </select>

</mapper>
  5. 测试 
    public class MyTest {

   @Test
   public void test() throws IOException {
       String resources = "mybatis-config.xml";
       InputStream in = Resources.getResourceAsStream(resources);
       SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(in);
       SqlSession sqlSession = sessionFactory.openSession(true);

       UserMapper mapper = sqlSession.getMapper(UserMapper.class);

       System.out.println("无参");
       List<user> userAllList = mapper.selectUser();
       for (user user : userAllList) {
           System.out.println(user);
       }

       System.out.println("含参");
       List<user> userList = mapper.selectbyid("bbb","123123");
       for (user user : userList) {
           System.out.println(user);
       }
   }

}

11.2、Mybatis-Spring

使用SqlSessionTemplate

  1. 实体类 user.java 
    public class user {
   private int id;
   private String name;
   private String pwd;

   @Override
   public String toString() {
       return "user{" +
               "id=" + id +
               ", name='" + name + '\'' +
               ", pwd='" + pwd + '\'' +
               '}';
   }

   public int getId() {
       return id;
   }

   public void setId(int id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getPwd() {
       return pwd;
   }

   public void setPwd(String pwd) {
       this.pwd = pwd;
   }
}
  2. mybatis配置文件 mybatis-config.xml （可以都写在mybatis-Spring 的配置文件中） 
    <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

   <!--    别名-->
   <typeAliases>
       <package name="com.yao.pojo"/>
   </typeAliases>

</configuration>
  3. mybatis-spring 配置文件 spring-dao.xml 
    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

   <!--    DataSource:使用spring的数据源替换mybatis的配置  c3p0 dbcp druid-->
   <!--    我们这里使用spring提供的jdbc 数据源-->
   <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
       <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
       <property name="url"
                 value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"/>
       <property name="username" value="root"/>
       <property name="password" value="rootroot"/>
   </bean>

<!--    sqlSessionFactory
   需要注入一个数据源、绑定一个mybatis
-->
   <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!--        数据源dataSource-->
       <property name="dataSource" ref="dataSource"/>
<!--        绑定mybatis-->
       <property name="configLocation" value="classpath:mybatis-config.xml"/>
       <property name="mapperLocations" value="classpath:com/yao/mapper/UserMapper.xml"/>
   </bean>

<!--    sqlSessionTemplate 就是我们在mybatis使用的sqlsession-->
   <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!--        只能使用构造去进行注入sqlsessionFactory-->
       <constructor-arg index="0" ref="sqlSessionFactory"/>
   </bean>

   <bean id="userMapper" class="com.yao.mapper.UserMapperImpl">
       <property name="sqlSessionTemplate" ref="sqlSession"/>
   </bean>
</beans>
  4. 接口 UserMapper 
    public interface UserMapper {

   public List<user> selectUser();

   public user selectbyid(
           @Param("name")String name,
           @Param("pwd")String pwd
   );

}
  5. 编写mapper.xml 
    <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
       PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
       "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.yao.mapper.UserMapper">

   <select id="selectUser" resultType="user">
       select * from mybatis.user;
   </select>

   <!--    普通传参-->
   <!--    <select id="selectbyid" parameterType="java.lang.String" resultType="user">-->
   <!--        select * from mybatis.user where id = #{id};-->
   <!--    </select>-->

   <!--    注释传参-->
   <select id="selectbyid" resultType="user">
       select id from mybatis.user
       where name=#{name} and pwd=#{pwd};
   </select>

</mapper>
  6. 接口实现类 UserMapperImpl.java 
    public class UserMapperImpl implements UserMapper {

   private SqlSessionTemplate sqlSessionTemplate;

   public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
       this.sqlSessionTemplate = sqlSessionTemplate;
   }

   public List<user> selectUser() {
       UserMapper mapper = sqlSessionTemplate.getMapper(UserMapper.class);
       return mapper.selectUser();
   }

   public user selectbyid(String name, String pwd) {
       UserMapper mapper = sqlSessionTemplate.getMapper(UserMapper.class);
       return mapper.selectbyid(name, pwd);
   }

}
  7. 测试 
    @Test
   public void test1(){
       ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml");
       UserMapper userMapper = context.getBean("userMapper", UserMapper.class);

       List<user> select = userMapper.selectUser();
       for (user user : select) {
           System.out.println(user);
       }

       System.out.println();
       user aaa = userMapper.selectbyid("aaa", "123123");
       System.out.println(aaa);
   }

使用SqlSessionDaoSupport

之后接口实现类的代码进行了部分的改变，其余的类个配置文件的代码均未改变

UserMapperImpl1.java

public class UserMapperImpl1 extends SqlSessionDaoSupport implements UserMapper {

    public List<user> selectUser() {
        UserMapper mapper = getSqlSession().getMapper(UserMapper.class);
        return mapper.selectUser();
    }

    public user selectbyid(String name, String pwd) {
        UserMapper mapper = getSqlSession().getMapper(UserMapper.class);
        return mapper.selectbyid(name,pwd);
    }
}

实现原理：让UserMapperImpl1类继承SqlSessionDaoSupport类，SqlSessionDaoSupport类包含getSqlSession()，可以直接调用这个方法得到sqlSession，但需要通过在spring-dao.xml里添加

<bean id="userMapper1" class="com.yao.mapper.UserMapperImpl1">
    <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>

将sqlSessionFactory参数传递过去，这样我们就得到了slqSession，后续的代码与之前一样。

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